There is a noticeable difference between the 6v6 and EL34 version. The 6v6 compresses quickly compared to the EL34. In my personal experience, this allows a much broader sweep in level of overdrive with the EL34. The 6v6 was a tad more Fender'ish, whereas the El34 is an improved Marshall clean.
The 6v6 overdrive is nice, but the EL34 just covers more bases, is much more dynamic and a warmth that doesn't cause ear fatigue at high volume. It's worth the difference.
Example tones I get: the Brown Sound, Classis Metal, Slash Tone, SRV, RHCP, Eagles, 80s Hair, Bonnamassa, Eric Johnson, Allmans, Rolling Stones, Alt-Rock, etc.
Does it djent? Heck, I dunno.